美国采购需求：背包、腰包、袜子、运动服饰、登山杖、运动器材

I've recently purchased the collapsible water bottles, but I've run into an issue with the straws. They don't seem to work properly, and I'm unsure if this is a common problem or if I received a defective batch. I'm looking for some guidance on how to address this situation. Should I proceed with returning the items, or is there a troubleshooting step I can attempt before taking that route? I want to ensure I'm utilizing the product correctly, but if the straws are indeed faulty, I'd prefer to resolve it through a return. Your prompt advice on this matter would be greatly appreciated!